JP2008119599A - Electric precipitator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric precipitator hardly generating a local short circuiting by lowering the vibration of a ground electrode plate even operating at a high wind speed. <P>SOLUTION: Earth electrode plates 52B of the electric precipitator are of a flat metal plate and are provided with a support hole 1 passing support metal tools for fixing ground electrode plates and a through-holes 2 for maintaining an insulation distance between the support hole 1 and a support metal tool for fixing discharging electrode plates 52A. The support holes 1 are located on the windward side beyond a center line A-A' with respect to a wind direction. The earth electrode plates 52B are fixed by a support metal tool 3 penetrating the support holes 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric dust collector installed in a closed space such as an automobile road tunnel or an underground parking lot.

  Air in a motorway tunnel is contaminated with fine dust such as automobile exhaust gas. In order to remove such fine dust, an electric dust collector that applies electric charge to the dust and electrically collects the dust is widely used.

  These electric dust collectors generally use a two-stage electric dust collector having a structure in which a charging portion and a dust collecting portion are independent. In the case of a two-stage electrostatic precipitator, since the charging portion and the dust collecting portion can be optimally designed individually, there is an advantage that dust can be removed with high efficiency. Many discharge wires with high charging efficiency have been adopted for the discharge electrode of the charging portion. Since the discharge wire may break when used for a long period of time, it is necessary to have a structure in which the discharge wire portion can be easily replaced. For this reason, in the case of a discharge wire type discharge electrode, generally, the support position of the ground electrode plate is provided only on the leeward side, and the discharge wire is arranged on the windward side of the charging unit so that the discharge line can be easily connected from the windward side of the charging unit It is designed to be exchangeable (for example, Patent Document 1). In recent years, discharge electrode plates having a plurality of protrusions on the end surface that do not cause disconnection are also being adopted. A discharge electrode plate having a plurality of protrusions on the end surface and a dust collector using such a discharge electrode plate are proposed. (For example, Patent Document 2).

In recent years, electric dust collectors for tunnel ventilation have been required to reduce installation space from the viewpoint of reducing civil engineering and construction costs. For this reason, an increase in the wind speed of electric dust collectors is progressing. By making the treatment wind speed higher, the dust collector installation cross-sectional area can be further reduced. The initial processing speed of an electric dust collector for tunnel ventilation was 7 m / s. However, in recent years, the processing wind speed has increased to 13 m / s. On the other hand, the introduction air path from the roadway to the electric dust collector has been arranged to be as short as possible.
JP 2001-232236 A Japanese Utility Model Publication No. 6-41849

  When the processing wind speed of the electrostatic precipitator increases and the introduction air path from the roadway to the electrostatic precipitator becomes short, the inflowing wind pulsates and eddy currents are likely to occur. When pulsation or eddy current is generated in the inflowing wind, vibration of the ground electrode plate is likely to occur. In particular, in the leeward-side single-end support method of the ground electrode plate widely employed in the discharge wire type, vibration is likely to occur particularly from the leeward side to the leeward side support position of the ground electrode plate. When the support ground electrode plate vibrates, the distance from the discharge electrode plate to which a high voltage is applied becomes short, and a local short circuit (spark) occurs between the discharge electrode plate and the ground electrode plate. The greater the vibration, the greater the spark frequency and the lower the dust collection rate. In such a case, there is a method of avoiding sparks by designing the gap between the discharge electrode plate and the ground electrode plate to be large, but this is contrary to the compactness required for the device in recent years because the device is enlarged. In addition, there is a method of increasing the strength of the ground electrode plate and suppressing the vibration by increasing the plate thickness, but this is not a good measure because it leads to an increase in weight and material cost. Further, as proposed in Patent Document 1, there is a method of providing a position regulating plate for preventing vibration at the other end (windward side) of the charging portion ground electrode plate support position. There is a problem that the depth direction of the apparatus becomes large because it is necessary to newly secure an insulation distance so that no spark occurs between the regulation plates. Therefore, a method for suppressing the vibration of the ground electrode plate without increasing the weight or material cost is required.

  In order to solve the above-mentioned problems, a first means of the present invention is that flat discharge electrode plates having protrusions on the end surfaces and flat ground electrode plates are alternately arranged in parallel to the wind flow. A charging portion that applies a high voltage to the discharge electrode plate to charge the dust, and a dust collection portion that collects the charged dust by Coulomb force, and the charging portion and the dust collection portion are independent of each other. In the two-stage electrostatic precipitator, the ground electrode plate of the charging unit includes an electrode plate support portion on the windward side of the center position in the depth direction of the electrode plate.

  By this means, even if the air flowing into the electrostatic precipitator is disturbed, such as pulsation or vortex, the vibration of the ground electrode plate of the charging unit can be suppressed and the rated voltage can be applied without increasing the size of the device. For the purpose.

  In another aspect, the support portion also serves as a power feeding portion.

  Further, the other means is characterized in that the support portion is supported through a rod-shaped support fitting in a support hole provided on the windward side of the center position in the electrode plate depth direction of the ground electrode plate.

  Another means is that the support portion is provided with slits at equal intervals in a rod-shaped support fitting, and a ground electrode plate is sandwiched between the slits.

  According to the present invention, even when the electrostatic precipitator is operated at a high wind speed, the vibration of the ground electrode plate can be suppressed small, and as a result, an electrostatic precipitator that is less likely to cause a local short circuit can be provided.

  According to a first aspect of the present invention, a flat discharge electrode plate having a protrusion on an end surface and a flat ground electrode plate are alternately arranged in parallel to the flow of wind, and the discharge electrode plate A two-stage type electric dust collector having a charging part that applies a high voltage to charge the dust and a dust collecting part that collects the charged dust by Coulomb force, and the charging part and the dust collecting part are independent of each other. In the machine, the ground electrode plate of the charging unit is provided with an electrode plate support portion on the windward side of the center position in the depth direction of the electrode plate, and the air flowing into the electric dust collector is disturbed by pulsation, eddy current, etc. Even if there is, the object is to suppress the vibration of the ground electrode plate of the charging unit and to apply the rated voltage without increasing the size of the apparatus.

  The invention according to claim 2 of the present invention is characterized in that the support portion also serves as a power feeding portion.

  The invention according to claim 3 of the present invention is characterized in that the support portion is supported through a rod-shaped support fitting in a support hole provided on the windward side of the center position in the electrode plate depth direction of the ground electrode plate. It is.

  According to a fourth aspect of the present invention, the support portion is formed by providing slits at equal intervals in a rod-shaped support fitting and sandwiching the windward side of the ground electrode plate in the slit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The electric dust collector 50 of the present invention is a two-stage type in which a charging unit 52 is disposed on the windward side of the air flow and a dust collecting unit 53 is disposed on the leeward side. Further, a high-voltage power source 51 </ b> A that supplies power to the dust collecting unit 53 and a high-voltage power source 51 </ b> B that supplies power to the charging unit 52 are provided on the side surface of the electric dust collector 50.

  FIG. 1 is an overall view of an electric dust collector according to the present embodiment. The charging unit 52 has a structure in which a plurality of ground electrode plates 52B are arranged in parallel at predetermined intervals, and a discharge electrode plate 52A is disposed between the ground electrode plates 52B. The dust collection portion 53 has load electrode plates 53A and dust collection electrode plates 53B arranged alternately at predetermined intervals.

  FIG. 2 is a diagram showing a ground electrode plate of the charging unit 52 of the electric dust collector according to the present embodiment. The ground electrode plate 52B is a metal flat plate, and is used to secure an insulation distance between the support hole 1 through which the support metal fitting is passed in order to fix the ground electrode plate and the support metal fitting for fixing the discharge electrode plate. A through hole 2 is provided. The support hole 1 is disposed on the windward side of the center line A-A ′ with respect to the wind direction.

  FIG. 3 is a view showing a discharge electrode plate of the electric dust collector according to the present embodiment. The discharge electrode plate 52 </ b> A has a plurality of protrusions 10 having a pointed tip at the end surface.

  FIG. 4 is a plan view showing the configuration of the charging unit of the electrostatic precipitator according to the present embodiment. In the charging unit 52, a plurality of ground electrode plates 52B are arranged in parallel at a predetermined interval D, and a discharge electrode plate 52A is arranged between the ground electrode plates 52B. The ground electrode plates 52 </ b> B are fixed to each other by a support fitting 3 that communicates with the support hole 1 and is energized by the support fitting 3.

  With the above configuration, the contaminated air containing dust or the like is caused to flow in with the side provided with the charging unit as the windward side. As the motive power, it is preferable to take a system of suction by a blower provided on the leeward side of the apparatus. Therefore, the charging unit 52 applies a high voltage to the discharge electrode plate 52A, and charges and charges the dust contained in the air by corona discharge generated between the discharge electrode plate 52A and the ground electrode plate 52B. Further, the dust collection unit 53 applies a voltage to the load electrode plate 53A to form an electric field with the dust collection electrode plate 53B, and collects charged dust on the dust collection electrode plate 53B by Coulomb force. At this time, even if the wind velocity flowing into the apparatus is fast or the inflowing air pulsates, the ground electrode plate 52B is fixed on the windward side of the ground electrode plate 52B, and therefore the ground electrode plate 52B is less likely to vibrate. Although the leeward side of the ground electrode plate 52B is not fixed, a plurality of ground electrode plates 52B and discharge electrode plates 52A are installed in parallel to the flow of the wind. Becomes smaller.

  Further, when the support hole 1 through which the support metal fitting 3 is passed is not provided in the ground electrode plate, a fixing method is provided in which the support metal fitting 3 is provided with slits at equal intervals, and the ground electrode plate 52B is sandwiched between the support metal fittings with the ground electrode plate 52B on the leeward side. But you can.

  FIG. 5 shows the results of an experiment in which ventilation was performed using an electric dust collector to which the present invention was applied. In order to verify the effect, vibration acceleration and amplitude were measured in the vicinity of the ground electrode plate support. As described above, according to the present invention, the vibration acceleration and the amplitude are improved by supporting on the leeward side as compared with the case of supporting on the leeward side. In addition, no local short circuit was observed.

  INDUSTRIAL APPLICABILITY The present invention can be applied to an electric dust collector that charges and charges dust by corona discharge and collects the charged dust by Coulomb force, and is particularly suitable when the installation location is limited.

Schematic of the electric dust collector according to Embodiment 1 of the present invention The figure which shows the ground electrode plate of the same electric dust collector The figure which shows the discharge electrode plate of the electric dust collector by this Embodiment The top view which shows the structure of the charging part of the electrostatic precipitator by this Embodiment The figure which shows the ventilation test result by the electric dust collector by this Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support hole 3 Support metal fitting 10 Protrusion 50 Electric dust collector 52 Charging part 52A Discharge electrode plate 52B Ground electrode plate 53 Dust collection part

Claims (4)

A flat discharge electrode plate having protrusions on the end surface and a flat ground electrode plate are alternately arranged in parallel to the flow of the wind, and a high voltage is applied to the discharge electrode plate to charge the dust. In the two-stage electric dust collector having a charging unit and a dust collecting unit that collects charged dust by Coulomb force, and the charging unit and the dust collecting unit are independent, a ground electrode plate of the charging unit is An electrostatic precipitator including an electrode plate support on the windward side of the center position in the electrode plate depth direction. The electrostatic precipitator according to claim 1, wherein the support portion also serves as a power feeding portion. 3. The electric collector according to claim 1, wherein the support portion is configured to support through a rod-shaped support fitting in a support hole provided on the windward side of the center position of the ground electrode plate in the depth direction of the electrode plate. Jin machine. 3. The electric dust collector according to claim 1, wherein the support portion is provided with slits at equal intervals in a bar-shaped support fitting, and the windward side of the ground electrode plate is sandwiched between the slits.

Images